Page author: David Giblin
Scutellaria lateriflora
madweed, mad-dog skullcap

Distribution: Both sides of the Cascades in Washington; occurring throughout North America.

Habitat: Moist bottomlands and meadows, low to moderate elevations.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Perennial herbs from slender, creeping rhizomes, the stems rising singly, 2-8 dm. tall, usually puberulent in lines.


Leaves opposite, petioles 0.5-2.5 cm. long, the blades thin, pinnately veined, mostly glabrous, ovate or lance-ovate, 3-8 cm. long and 1.5-5 cm. wide, with rounded teeth and broadly rounded base.


Flowers in axillary racemes, or terminal on axillary branches, the racemes 2-12 cm. long; calyx two-lipped, the upper lip with a prominent transverse appendage, 1.5-2.5 mm. long; corolla blue, 6-8 mm. long, two-lipped, the short upper lip hood-like, the lower 3-lobed, surpassing the upper lip, the center lobe large, the lateral lobes attached to the upper lip; stamens 4, the lower pair longer than the upper and with one of the pollen sacs abortive; style 2-parted; ovary 2-celled, superior.


Nutlets 4

Accepted Name:
Scutellaria lateriflora L.
Publication: Sp. Pl. 2: 598-599. 1753.

Synonyms & Misapplications:
Scutellaria lateriflora L. var. lateriflora
Additional Resources:

PNW Herbaria: Specimen records of Scutellaria lateriflora in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Scutellaria lateriflora checklist entry.

E-Flora BC: Scutellaria lateriflora atlas page.

CalPhotos: Scutellaria lateriflora photos.

USDA Plants: Scutellaria lateriflora information.

14 photographs:
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